1269 User Manual
Understanding The 1269 6-8
rise relative to the ambient temperature, and
outputs a voltage proportional to the maximum
temperature rise at the rear panel monitor
connector J414.
C
Calculates the maximum VXI slot temperature
and outputs a voltage proportional to the
maximum slot temperature at the rear panel
monitor connector J414.
C
C
Provides an RS-232 interface(J412) over which
commands may be received and replies sent by
the EMS.
User Limits On EMS
Monitored Parameters
Many of the monitored functions provide the capability for the
user to program upper and/or lower limit values. When a limit
is exceeded, the EMS will generate a VXI interrupt (if enabled
to do so) which notifies the user of an alarm condition. Refer
to
Chapter 4 Using the Enhanced Monitoring System
for
complete information.
Timestamps on EMS
Monitored Events
For many of the monitored functions, a timestamp is saved by
the EMS software. This time stamp indicates the time of the
most recent occurrence of an alarm condition for that
monitored function. The timestamp may be queried by the
user via SCPI commands. The timestamp includes both time
and date information for the alarm. Refer to
Chapter 4 Using
the Enhanced Monitoring System
for complete information.
EMS Rear Panel Fan
Speed Monitor
A TTL pulse train at the speed (RPM) of the cooling fan is
output to the EMS rear panel Monitor Connector J414. The
fan outputs two pulses per revolution.
EMS Fan Speed
Control
The speed of the module cooling fan is controlled by either the
slot with the highest absolute temperature or the highest
temperature rise.
If the absolute temperature of any slot e40
E
C, the
module fans operate at full speed. If the temperature rise of
any module slot exceeds 10
E
C, the module fans operate at full
speed.
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